Hadronic Weak Decays of Charmed Baryons in the Topological Diagrammatic Approach: An Update
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arXiv
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2024
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| author | Cheng, Hai-Yang Xu, Fanrong Zhong, Huiling |
| author_facet | Cheng, Hai-Yang Xu, Fanrong Zhong, Huiling |
| contents | There exist two distinct ways in realizing the approximate SU(3) flavor symmetry of QCD to describe the two-body nonleptonic decays of charmed baryons: the irreducible SU(3) approach (IRA) and the topological diagram approach (TDA). The TDA has the advantage that it is more intuitive, graphic and easier to implement model calculations. We perform a global fit to the currently available data of two-body charmed baryon decays within the framework of the TDA and IRA. The number of the minimum set of tensor invariants in the IRA and the topological amplitudes in the TDA is the same, namely, five in the tree-induced amplitudes and four in the penguin amplitudes. Since we employ the new LHCb measurements to fix the sign ambiguity of the decay parameters $β$ and $γ$, the fit results for the magnitudes of $S$- and $P$-wave amplitudes and their phase shift $δ_P-δ_S$ in both the TDA and IRA are more trustworthy than our previous analyses with uncertainties substantially improved. These results can be tested in the near future. The perspective of having direct {\it CP} violation in the charmed baryon sector at the per mille level is briefly discussed. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2410_04675 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Hadronic Weak Decays of Charmed Baryons in the Topological Diagrammatic Approach: An Update Cheng, Hai-Yang Xu, Fanrong Zhong, Huiling High Energy Physics - Phenomenology High Energy Physics - Experiment There exist two distinct ways in realizing the approximate SU(3) flavor symmetry of QCD to describe the two-body nonleptonic decays of charmed baryons: the irreducible SU(3) approach (IRA) and the topological diagram approach (TDA). The TDA has the advantage that it is more intuitive, graphic and easier to implement model calculations. We perform a global fit to the currently available data of two-body charmed baryon decays within the framework of the TDA and IRA. The number of the minimum set of tensor invariants in the IRA and the topological amplitudes in the TDA is the same, namely, five in the tree-induced amplitudes and four in the penguin amplitudes. Since we employ the new LHCb measurements to fix the sign ambiguity of the decay parameters $β$ and $γ$, the fit results for the magnitudes of $S$- and $P$-wave amplitudes and their phase shift $δ_P-δ_S$ in both the TDA and IRA are more trustworthy than our previous analyses with uncertainties substantially improved. These results can be tested in the near future. The perspective of having direct {\it CP} violation in the charmed baryon sector at the per mille level is briefly discussed. |
| title | Hadronic Weak Decays of Charmed Baryons in the Topological Diagrammatic Approach: An Update |
| topic | High Energy Physics - Phenomenology High Energy Physics - Experiment |
| url | https://arxiv.org/abs/2410.04675 |